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If by "Help" you mean side in the battle for the Dam, then they won't help you, regardless of which side you join.I f you mean join them, or become friendly to them, the go into their bunker in hidden Valley, and you will be approached by a group of Paladins who will take you to their Elder. Talk to him, and he will give you a quest. Do that, and the quest after, and you will be able to join the Brotherhood and get Power Armour training.

Now the Remnants Bunker, that is a much bigger task.You get the quest from Arcade Gannon, a Follower of the Apocalypse in the Mormon Fort in Freeside, New Vegas. If you haven't talked to him yet, then get ED-E as a follower, and go talk to him, and he should give you the quest (Auld Lang Syne) instantly. If you have talked to him, then activating the quest is a bit more difficult.

First of all, you need to get 2 Approval points by doing any of the following (taken from the Fallout Wiki)

-Traveling to a few places in the Mojave Wasteland with Arcade will trigger a comment and gain the player points:~1 point for traveling with Arcade to the Crashed Vertibird. (The approval doesn't increase until Arcade comments on it.)~1 point for traveling with Arcade into the REPCONN Headquarters building. (The approval doesn't increase until Arcade comments on the company.)~Traveling to The Fort with Arcade triggers a dialogue with Arcade inquiring why they are there.~2 points for saying, "Let's just listen to him, figure out what he's up to, and get out."~1 point for saying, "I just want to hear Caesar out."~1 point for saying, "With how messed up New Vegas is, do you really think Caesar has nothing to offer?", followed by, "I'm just trying to be open-minded."

-Speaking to Thomas Hildern about anything at all (any conversation that ends with Hildern saying, "Yes...Goodbye." or "Wrong turn?...") with Arcade along will cause Arcade to start a conversation afterwards about Hildern and his motives (one time).~2 points for saying, "Good thing there are still people like you around."~1 point for saying, "I'm sure he means well."

-During the quest That Lucky Old Sun, when the player gets to the mainframe, Arcade will spontaneously suggest that the power should be directed to Fremont and Westside.~1 point for saying, "Of course."~1 point for saying, "Why not to the whole area equally?", then passing an intelligence check of 7, saying, "Redundancy. If Caesar takes the dam and cuts off power, it will be chaos all over New Vegas." when Arcade asks why.Note that it is not necessary for the player to do what Arcade wants; the trigger is the pre-diversion dialogue, not the action of diverting the power.

-There are several triggers associated with the quest The White Wash:~1 point for saying, "If you say so. I'm not arguing." when Arcade mentions that he's heard about Anderson, if the player visits Westside with him after having already completed The White Wash without him along.~2 points for completing The White Wash by blaming the problem on the Scorpions and letting Tom Anderson go. (The approval doesn't increase until Arcade comments on it.)~1 point for completing The White Wash by getting Tom Anderson to turn himself in with a fake story about fighting over Dazzle, but letting Westside Co-op continue to have the water. (The approval doesn't increase until Arcade comments on it.)~1 point for passing an intelligence check of 7, saying, "You're assuming a motive without evidence. Please be rational." when Arcade gets mad about killing Tom Anderson at the end of The White Wash. (Obviously, this only happens if the player kills Tom Anderson.)~1 point for saying, "It's cleaner this way, without bringing NCR in. No connecting Anderson back to the locals." in answer to Arcade's followup question to the above, asking why the player killed Anderson

After doing that, you need to reach a certain point in the story, as told below: (Also from the Fallout Wiki)

-The House Always Wins, part V is active, and the player reports back to Mr. House that the Brotherhood of Steel bunker has been wiped out.

-Wild Card: Change in Management is active and the player installs Yes Man into the Lucky 38 mainframe.For the Republic, Part 2 is active and the player reports back to Colonel Moore that Mr. House has been killed or disconnected from his mainframe.Even if the player has not accumulated two "like" points, Arcade will still offer the quest when the following point is hit:

-Wild Card: Finishing Touches is active and the player installs the override chip in the El Dorado Substation.

You can't get the quest if following the Legion, butt can follow another story up to one of the points, then switch to the Legion.

Once you've got the quest started, follow it and you will eventually gain access to the Remnants Bunker. If you have the other set of remnants armour from the Deathclaw place and the Cazador Nest, then leave those behind while going to the Bunker, and you will get a second set.

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